部分森林覆盖山区电波传播特性预测的快速算法

为提高部分森林覆盖山区电波传播特性预测的时效性，提出了一种基于宽角抛物方程(PE)的快速预测算法。采用PE通过分步傅里叶变换(SSFT)求解；在SSFT步进迭代过程中，根据传播路径上森林的等效介电常数、地形的起伏情况，动态选择PE的水平步长。通过对部分森林覆盖的不规则地形条件下的电波传播特性进行仿真，探讨了该方法的可行性和有效性。结果表明：相比于均匀大步长算法，该方法更准确；而相比于均匀小步长算法，该方法能够保证抛物方程的计算精确度，同时极大地提高计算效率。

A fast prediction method of radio wave propagation in partly forested terrain environment

A fast prediction method based on parabolic equation is presented for the timeliness of the radio wave propagation in large scale partly forested irregular terrain environment. The wide angle Parabolic Equation(PE) method is used, which is solved by Split-Step Fourier Transform(SSFT). In the SSFT step iteration process, the level step is determined dynamically, according to the equivalent dielectric permittivity of forest and irregular terrain. The feasibility and validity of the fast prediction method is verified by simulating the radio propagation characteristic in the partly forested irregular terrain. The results show that the method has higher accuracy compared with the uniform coarse step, and could improve the computational efficiency greatly compared with fine accuracy.